Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f9bbc45f93da87…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 15:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c332e7e3d329ea205a60008733b4fad0 SHA-1: 7b186628758592789303897f48506e1d2503444e SHA-256: 64f9bbc45f93da87c9d632f16e442a7f2001bac78ff37cfd686524642df1201c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on disposable or compromised domains, suggesting an attempt to direct users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lblussana.it/images/file/zefubivoxuf.pdf In PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/zegulokarazex.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090206560134.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/adfb1936d61d8aeb619bcd90a5fff7e2/34160686918.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e856662e7---22133724430.pdfIn PDF document text
    • http://orenprom.com/img/account/file/69640257989.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/3062229824.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/36948438859.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/gimaw.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/guterutemivaromevadogopax.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210909182743.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb9e5c8cf---pulimupujexumedipepetab.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/74497057607.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/99069006732.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/40053030578.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zubesariwigomel.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413aad2442f---90255648906.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/48397953011.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/sidolaloxexaxowosidufu.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/44742757707.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905192458.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/89714199825.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/57651894437.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/98708369401.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/5110902591.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/didafep.pdfIn PDF document text
    • http://abc-tel.ru/data/File/metakiridubisupuvi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/70120732267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=austin+and+ally+dallasPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10573 20492 bytes
SHA-256: ffcb1c20dac65619f95247741e53a8c666576340748509f0527d301ad702298e
font_02_sfnt_off00013b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1F 10084 bytes
SHA-256: 350807d3100af4326802d77686cf0ced95b86bc9801d11b6a7840fe52e9789f8